IBM 3270 User Manual page 41

Type a line of words in the space provided below. For example:
anything anything anything anything
Try to type a word into the right margin. As you type a
character into the right margin, the partially typed
word moves to the following blank line. That is word wrap
in operation.
Try it now.
Experiment with word wrap some more in the space provided
to get a good feel for how it works. Word wrap
requires a blank line following the line being typed on.
If you try to wrap when the next line is not blank, the
keyboard locks. Try that too.
Note: For Configuration Support B Release 2 or later, if the input
area of the next line contains more than one field, only the ^ '
first field must be empty. (See your system administrator
if you are not sure what configuration your system uses.)
The RESET key clears keyboard lockups.
To turn word wrap on or off, press the WRAP key.
If word wrap is on (the symbol is visible) ,
press the WRAP key to turn it off.
If word wrap is off (no arrow), press the WRAP key to turn it on.
Try it a few times.
If you type a character into the right margin when word wrap is off,
the keyboard locks. Turn off word wrap and type a word
into the right margin to see how the keyboard locks.
Unlock the keyboard and turn word wrap on again before proceeding. '
5-4 Entry Assist User's Guide